气候变化领域集成服务门户(CCPortal): Directions of lithosphere interactions in the Pamir - Hindu Kush junction inferred from anisotropic tomography

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DOI	10.1139/cjes-2019-0081
	Directions of lithosphere interactions in the Pamir - Hindu Kush junction inferred from anisotropic tomography
	Aminov, Jamshed; Koulakov, Ivan; Jakovlev, Andrey; Zhao, Junmeng; El-Khrepy, Sami; Aminov, Jovid; Al Arifi, Nassir; Aminov, Javhar; Mamadjanov, Yunus
通讯作者	Aminov, J (通讯作者)
发表日期	2020
ISSN	0008-4077
EISSN	1480-3313
起始页码	601
结束页码	629
卷号	57 期号:5
英文摘要	The Pamir and Hindu Kush are examples of a puzzling collision system where a complex junction of colliding lithospheric plates coexists with intermediate depth seismicity at 300 km. In this study, we constructed a new tomography model using travel time data from local events recorded by the TIPAGE (Tien Shan - Pamir Geodynamic program) network. In addition to the P- and S-wave velocities down to 200 km, we derived the azimuthal anisotropy. The velocity anomalies were consistent with the results of previous studies. In the crust, the velocity structure and anisotropy directions were mainly oriented along major suture zones. At depths of 80-120 kin, a narrow low-velocity anomaly coinciding with the distribution of deep seismicity was interpreted as a trace of entrained crustal material by the dipping lithosphere. The anisotropy directions at these depths were mainly oriented northwest-southeast and were interpreted as indicating the direction of the motion of colliding plates. The difference in the magnitude of anisotropy south and north of the Pamir seismic zone suggests that the lithosphere coming from the south possesses less anisotropy than that of the Asian plate. The local tomography model was supplemented by previously computed regional tomography that expanded the area both laterally and axially. Beneath the Pamir, both continental plates coming from the north and south form a drop-shaped anomaly that will possibly delaminate in time. Beneath the Hindu Kush, we could clearly trace a continuous almost vertical subduction of the Katawaz block from the south. Thus, the continental collision beneath the Pamir and subduction beneath the Hindu Kush are separate processes with different rates and directions of plate movement.
关键词	PRINCE CREEK FORMATION SOUTHERN ALBERTA BONE BED TAPHONOMY DINOSAUR CANADA RIVER AGE
英文关键词	Pamir; Hindu Kush; seismic tomography; anisotropy; continental collision; subduction
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000529401000003
来源期刊	CANADIAN JOURNAL OF EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260095
推荐引用方式 GB/T 7714	Aminov, Jamshed,Koulakov, Ivan,Jakovlev, Andrey,et al. Directions of lithosphere interactions in the Pamir - Hindu Kush junction inferred from anisotropic tomography[J]. 中国科学院青藏高原研究所,2020,57(5).
APA	Aminov, Jamshed.,Koulakov, Ivan.,Jakovlev, Andrey.,Zhao, Junmeng.,El-Khrepy, Sami.,...&Mamadjanov, Yunus.(2020).Directions of lithosphere interactions in the Pamir - Hindu Kush junction inferred from anisotropic tomography.CANADIAN JOURNAL OF EARTH SCIENCES,57(5).
MLA	Aminov, Jamshed,et al."Directions of lithosphere interactions in the Pamir - Hindu Kush junction inferred from anisotropic tomography".CANADIAN JOURNAL OF EARTH SCIENCES 57.5(2020).